Epson WF-7840 Series User Manual page 252

Solving Problems
If the printer is placed in a location near a light source or subjected to direct sunlight, the
original size may not be detected correctly.
Solutions
Select the original size manually, and then try again.
Original is too thin to detect the size automatically.
Solutions
Select the original size manually, and then try again.
Uneven Colors, Smears, Dots, or Straight Lines Appear in the Copied Image
The following causes can be considered.
The paper path is dirty.
Solutions
Load and eject paper without printing to clean the paper path.
"Cleaning the Paper Path for Ink Smears" on page 153
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There is dust or dirt on the originals or the scanner glass.
Solutions
Remove any dust or dirt that adheres to the originals, and clean the scanner glass.
"Cleaning the Scanner Glass and Document Mat" on page 153
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There is dust or dirt on the ADF or originals.
Solutions
Clean the ADF, and remove any dust or dirt that adheres to the originals.
"Cleaning the ADF" on page 155
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The original was pressed with too much force.
Solutions
If you press with too much force, blurring, smudges, and spots may occur.
Do not press with too much force on the original or the document cover.
"Placing Originals" on page 37
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Printing, Copying, Scanning, and Faxing Quality is Poor
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Copy Quality is Poor